Earthquake

• Result of movement in the Earth’s surface crust up to 700km deep

• The epicentre of an earthquake is the centre/starting point 

Transform Boundaries:

• When plates slide against each other, they create a tremor, as the crust is jagged, creating places with high friction.

Triangulation:

• is a technique to locate the epicentre

• Seismometers calculate the magnitude of an earthquake and are used to locate the epicentre

• A seismograph that uses the Richter scale measures the energy of earthquakes

• A seismograph that uses the Mercalli scale measures the energy of earthquakes, the severity of the earthquake (it is subjective to humans)

Seismic Waves:

• a measuring unit used to measure the length of waves of earthquakes.

• They are measured in P-waves, S-waves and L-waves.

P-Waves:

• a compression waves, which have pockets of high pressure and low-pressure areas.

• they are longitudinal (move horizontally)

• the fastest of the three waves